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A practical treatise on the steel square and its application to everyday use : being an exhaustive collection of steel square problems and solutions, "old and new", with many original and useful additions, forming a complete encyclopedia of steel square knowledge, together with a brief history of the square, and description of tables, keys and other aids and attachments (1903)

Hodgson, Fred. T. (Frederick Thomas), 1836-1919 · Riverside, Ill. : Radford Architectural Co. · leaf 91

An illustration from A practical treatise on the steel square and its application to everyday use : being an exhaustive collection of steel square problems and solutions, "old and new", with many original and useful additions, forming a complete encyclopedia of steel square knowledge, together with a brief history of the square, and description of tables, keys and other aids and attachments, 1903, leaf 91
distance to be gaugedfrom each corner to mark the corners of theoctagon. To Lay Off an Octagon on a Given Side, Fig. 4.Q,—Prolong the given side ab and lay off an angle 88 PRACTICAL USES OF of 450 at both a and b. The lines, i, 2, are squared up from the givenside, also lines 3 and 4.By applying… … r/\ 7/\ *^\\ ^ V ^ ^ Fig, 50 corners on the same side of the blade or ruletouch the edges of the stick. Make marks at the7-inch and the 17-inch marks. Measure thus ateach end of the stick. Lines struck throughthese points show what is to come off to make itoctagonal. To Find the Side of an Octagon…

Carpenters' squares · Architecture, Domestic · Equerre de charpentier

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